clarifier drive Articles

  • Clarifier maintenance

    Clarifiers are expensive, to buy or repair, and their downtime can be costly in fines imposed by regulatory agencies and in community ill will. Regular maintenance, an annual inspection of the mechanism and an occasional touchup of the paint or coating system are simple and inexpensive proactive steps that will usually prevent most problems. Three components of all clarifiers require maintenance: ...


    By WesTech Engineering, Inc.

  • The Monclova experience case study

    The Town of Monclova, Mexico found it necessary to increase the hydraulic capacity of its municipal wastewater treatment plant by 35% – from approximately 11.5 MGD to 15.5 MGD. The increase in flow was accomplished by upgrading the plant’s biological treatment process. Once the modifications were completed, the flow through the plant was gradually increased. As the increased flow ...


    By NEFCO, Inc.

  • Cost-profit analysis of multilateral recycling system in Asia

    The objective of this study is to clarify quantitatively the driving force of multilateral recycling system in Asia, especially focusing on economic factors. To this end, we proposed a cost-profit analysis model for multilateral recycling system considering the differentials of economic factors between developed and developing countries at first. Based on this model, we conducted cost-profit ...


    By Inderscience Publishers

  • Degradation of rangeland ecosystems in the developing world: tragedy of breaking coupled human–natural systems

    Understanding the mechanisms that regulate rangeland health will contribute to our knowledge of complex coupled human–natural systems (CHANS). This will require the integration of multiple, complementary and independent methods of CHANS to open new opportunities for dialogue among natural and social scientists, particularly with regard to the interplay between ecological, social and economic ...


    By Inderscience Publishers

  • Energy and the world: a physicist's view

    The evolution of human societies depends upon the availability of energy resources. Since the word energy does not have the same meaning for physicists and the general public, this point is clarified first. Then, a selection of energy and societal problems are reviewed. Although energy per se does not drive society, it has played a major role in the successive industrial revolutions which have ...


    By Inderscience Publishers

  • Innovative, effective, and environmentally sound solution: MBR wastewater treatment systems

    Over the past 10 years, MBR technology has advanced to become a serious contender to conventional wastewater treatment technologies, and is now considered a proven technology. MBR systems with submerged membrane modules offer two main advantages: A significantly improved effluent quality and a substantially smaller footprint.Membrane Biological Reactor (MBR) technology is a simple, yet effective ...


    By Newterra

  • Ovivo Double Entry Drum Screens at Yellow River WRF, Gwinnett County, GA – Customer Testimonial

    “We completed the Yellow River WRF Improvements Project in 2012. This project replaced an aging 14.0 MGD conventional activated sludge facility with an advanced 22.0 MGD MBR facility. The MBR facility includes third party submerged fiber membrane for solids separation. The membrane manufacturer required, at a minimum, 2mm screening to protect the .04 micron membrane. We decided to purchase ...

  • Case study - Supplemental aeration nearly eliminates filamentous sludge bulking

    The Dubai Investments Park Wastewater Treatment plant in the United Arab Emirates faced challenges in their oxidation ditch due to filamentous sludge bulking, resulting in poor sludge settling in the secondary clarifier. Supplemental aeration was needed to eliminate the filamentous sludge bulking. Challenge: The oxidation ditch is treating an ...

  • Acid mine drainage treatment

    Acid mine/rock drainage is a rampant problem in the world today. The above photo depicts acid drainage at an abandoned mine in the Yukon Territory of northwest Canada. This mine shares a similar history to thousands of other mines throughout the world. It was in operation for six short years in the 1950’s, producing gold ore. Its profitability eventually failed and it was abandoned. In the ...


    By WesTech Engineering, Inc.

  • Dynamic Mathematical Modeling of Membrane Fouling in Submerged Membrane Bioreactors

    ABSTRACTA mathematical model is developed that accounts for internal fouling of membranes due to soluble microbial products during subcritical flux operation, and for supercritical flux fouling due to cake formation and compression.. The model takes into account the filtration effect generated by the cake. A set of differential equations is derived and solved numerically to obtain a description ...

  • VFD for pumping systems

    Pumping systems account for nearly 20% of the world's electrical energy usage. In some process plants, the VFD for pumps and fans together account for between 50% and 80% of the total electricity used. Very rarely have I come across pumps operating with fully open discharge valves. The same is the case for fans with dampers. ...


    By Variable Frequency Drives

  • Nano disclosures: too small to matter or too big to ignore?

    Determining whether the presence of nanoscale materials in chemical substances, mixtures, and articles triggers a disclosure obligation is complicated. The decision turns on a calculus that includes what law applies, what is known about the presence of nanoscale components, what knowledge standard applies, whether and how a nanoscale material is defined, and an entity’s interpretation of ...


    By Bergeson & Campbell, P.C.

  • Explore the capabilities of nanofiltration and ultrafiltration. Filters have similar looks, different applications

    Introduction Even if you’re an expert in reverse osmosis (RO) membrane technology, you may be overlooking some applications using often neglected cousins of RO: nanofiltration (NF) and ultrafiltration (UF). Although virtually identical in looks to RO membranes, NF and UF membranes serve distinctly different separation functions. Dramatic levels of resource recovery, efficiency ...

  • Fine screens help New Jersey wastewater treatment plant stop rag and grease problems

    A few years ago the Hammonton Wastewater Treatment Plant, located in the lush green countryside of southern New Jersey, faced continuous problems with rags, trash and plastics passing right through a rusty old bar screen and into the oxidation ditch and final clarifier.After years spent unclogging pumps, clearing out trash and untangling the UV system – plant managers decided to find a better ...


    By JWC Environmental

  • Introduction to Decentralized Packaged Wastewater Treatment (PWWT) Systems - PDH Article

    Learning Objectives After reading this article, you should understand: Functions and processes of a decentralized PWWT system; Design considerations of a PWWT system. Overview "Clean water will be the oil of the 21st Century." The accuracy and magnitude of this statement is resonating worldwide. ...

  • Governance of new technologies: recommendations for responsible innovation in nanotechnology

    Effective risk governance is important when developing new technologies. This study assessed the approaches to governance of nanotechnology in Europe, based on a comprehensive review of literature and practices, complemented by discussions with key stakeholders. The study provides a new analytical framework for exploring the strengths and weaknesses of governance strategies and makes ...

  • Editor’s perspective - solvent cleanup standards

    Risk-assessment science is a critical tenet of the remediation industry, as it is the underlying basis of the majority of cleanup work performed. However, risk-assessment science is, for the most part, poorly understood by a large portion of environmental professionals. Most seasoned professionals understand the basic risk-assessment concepts related to the dose-response and exposure duration ...

  • Industry Experts Address Solutions for Major Safety and Environmental Hazards and Risks Prevalent in Fossil-Fuel Power Plants

    The upcoming marcus evans HSE Excellence for Fossil Generation Conference — set to take place August 6–8, 2013, in Dallas, Texas — will address critical challenges and lessons learned in the industry to drive solution-based topics, including worksite safety management, confined space, safety training, fall ...


    By Marcus Evans

  • Joint EUCAR/JRC/CONCAWE Study on: Effects of Gasoline Vapour Pressure and Ethanol Content on Evaporative Emissions from Modern Cars

    CONCAWE, EUCAR and the Joint Research Centre of the European Commission jointly carried out a major test programme specifically designed to investigate the influence of gasoline vapour pressure and ethanol content on evaporative emissions from modern passenger cars as determined using the current European regulatory test procedure. Breathing losses through the tank vent and fuel permeation are in ...


  • Thematic Issue: Nanomaterials’ Functionality

    Nanomaterials: addressing the challenges, benefiting from the opportunities Some of the deepest challenges we will face in the coming decades derive from the opportunities offered by emerging technological advances. Many of these will improve our quality of life, and develop our economies, but all will be measured against the overarching principle that we do not make some error, and harm ...

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